On 9/1/22 14:58, Arvid Norlander wrote:
This expands on the previous commit, exporting the fan RPM via hwmon.
This will look something like the following when using the "sensors"
command from lm_sensors:
toshiba_acpi_sensors-acpi-0
Adapter: ACPI interface
fan1: 0 RPM
Signed-off-by: Arvid Norlander <lkml@xxxxxxxxx>
---
drivers/platform/x86/Kconfig | 1 +
drivers/platform/x86/toshiba_acpi.c | 72 +++++++++++++++++++++++++++++
2 files changed, 73 insertions(+)
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index f2f98e942cf2..4d0d2676939a 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -797,6 +797,7 @@ config ACPI_TOSHIBA
depends on INPUT
depends on SERIO_I8042 || SERIO_I8042 = n
depends on ACPI_VIDEO || ACPI_VIDEO = n
+ depends on HWMON || HWMON = n
depends on RFKILL || RFKILL = n
depends on IIO
select INPUT_SPARSEKMAP
diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 02e3522f4eeb..a976dfb97a5e 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -46,6 +46,10 @@
#include <linux/toshiba.h>
#include <acpi/video.h>
+#ifdef CONFIG_HWMON
+#include <linux/hwmon.h>
+#endif
ifdef not needed here.
+
MODULE_AUTHOR("John Belmonte");
MODULE_DESCRIPTION("Toshiba Laptop ACPI Extras Driver");
MODULE_LICENSE("GPL");
@@ -171,6 +175,9 @@ struct toshiba_acpi_dev {
struct miscdevice miscdev;
struct rfkill *wwan_rfk;
struct iio_dev *indio_dev;
+#ifdef CONFIG_HWMON
+ struct device *hwmon_device;
+#endif
int force_fan;
int last_key_event;
@@ -2941,6 +2948,54 @@ static int toshiba_acpi_setup_backlight(struct toshiba_acpi_dev *dev)
return 0;
}
+/* HWMON support for fan */
+#ifdef CONFIG_HWMON
This should be #if IS_REACHABLE(CONFIG_HWMON)
+umode_t toshiba_acpi_hwmon_is_visible(const void *drvdata,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ return 0444;
+}
+
+int toshiba_acpi_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ /*
+ * There is only a single channel and single attribute (for the
+ * fan) at this point.
+ * This can be replaced with more advanced logic in the future,
+ * should the need arise.
+ */
+ if (type == hwmon_fan && channel == 0 && attr == hwmon_fan_input) {
+ u32 value;
+ int ret;
+
+ ret = get_fan_rpm(toshiba_acpi, &value);
+ if (ret)
+ return ret;
+
+ *val = value;
+ return 0;
+ }
+ return -EOPNOTSUPP;
+}
+
+static const struct hwmon_channel_info *toshiba_acpi_hwmon_info[] = {
+ HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT),
+ NULL
+};
+
+static const struct hwmon_ops toshiba_acpi_hwmon_ops = {
+ .is_visible = toshiba_acpi_hwmon_is_visible,
+ .read = toshiba_acpi_hwmon_read,
+};
+
+static const struct hwmon_chip_info toshiba_acpi_hwmon_chip_info = {
+ .ops = &toshiba_acpi_hwmon_ops,
+ .info = toshiba_acpi_hwmon_info,
+};
+#endif
+
static void print_supported_features(struct toshiba_acpi_dev *dev)
{
pr_info("Supported laptop features:");
@@ -2995,6 +3050,11 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
remove_toshiba_proc_entries(dev);
+#ifdef CONFIG_HWMON
#if IS_REACHABLE()
+ if (dev->hwmon_device)
+ hwmon_device_unregister(dev->hwmon_device);
+#endif
+
if (dev->accelerometer_supported && dev->indio_dev) {
iio_device_unregister(dev->indio_dev);
iio_device_free(dev->indio_dev);
@@ -3187,6 +3247,18 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
ret = get_fan_rpm(dev, &dummy);
dev->fan_rpm_supported = !ret;
+#ifdef CONFIG_HWMON
... and again.
+ if (dev->fan_rpm_supported) {
+ dev->hwmon_device = hwmon_device_register_with_info(
+ &dev->acpi_dev->dev, "toshiba_acpi_sensors", NULL,
+ &toshiba_acpi_hwmon_chip_info, NULL);
+ if (IS_ERR(dev->hwmon_device)) {
+ dev->hwmon_device = NULL;
+ pr_warn("unable to register hwmon device, skipping\n");
+ }
+ }
+#endif
+
toshiba_wwan_available(dev);
if (dev->wwan_supported)
toshiba_acpi_setup_wwan_rfkill(dev);
